6.0.0

Major update to support Titanium 9.0.0+ and Android and iOS SDKs.

Changes

• Updated Airship Android SDK to 13.1.2
• Updated Airship iOS SDK to 13.3.2
• Updated Titanium to 9.0.0
• Changed module name from UrbanAirship to AirshipTitanium
• Changed module id from com.urbanairship to ti.airship